﻿1850.] 



TRIMMER ON THE ERRATICS OF NORFOLK, 



27 



North of the road, in a brickfield laid down on the map above re- 

 ferred to, is a bed of blue clay opened to the depth of about 12 feet 

 which resembles that of the Nar, with the difference that it contains 

 some small pebbles of chalk, and that no organic remains have been 

 found in it. 



About half a mile east of this, still on the north side of the road, is 

 a pit now full of water, but reported to have exhibited, when worked, 

 the same characters as the last. 



Three furlongs further eastward on the southern side of the road 

 is the pit of freshwater clay and calcareous sand which I have de- 

 scribed in the paper on the Geology of -Norfolk *, previously referred 

 to, and from which I extract the following section (fig. 1, p. 28) and 

 description : — 



" In this pit several beds of clay and calcareous sand rest upon the 

 irregular surface of a bed resembling the chalky varieties of the till. 

 The surface consists of a loamy warp, containing in some parts accu- 

 mulations of flints of considerable size, and filling furrows and pipes 

 deeply excavated in the calcareous sand and associated clay. The 

 depth and extent of the several beds will be best understood from the 

 accompanying section. From the spot where the word 'Bones' 

 occurs, Mr. Rose has obtained a nearly complete set of the teeth of 

 the lower jaw of a species of Bos. From the numerous fragments of 

 a very thin univalve in the calcareous sand, accompanied by horny 

 opercula resembling those of a small Paludina, and from part of a 

 Unio occurring in one of the beds of clay, I was satisfied that they 

 were freshwater deposits. The specimens which I procured were 

 too imperfect to enable me to obtain an opinion from an eminent 

 naturalist, but Mr. Rose, who conducted me to the spot, and who 

 was reluctant at first to believe them fluviatile, has recently set the 

 question at rest by the discovery of several specimens of Cyclas and 

 one of Planorbis." This pit not having been worked since 1846, I 

 can add no further particulars respecting it ; but several other pits 

 have been opened higher up the valley, which I have recently ex- 

 amined, and which I shall now describe. 



About three furlongs east of the last, in a plantation marked on 

 the map, at the point where the road from Gaytonthorpe to Massing- 

 ham falls into that from Lynn to Litcham, is a gravel-pit worked to 

 the depth of between four and five feet, consisting of coarse chalk 

 flints, very few of them at all abraded. About six chains further 

 east is a clay or marl pit, of which the following is a section : — 



1 . At the surface sandy loam, varying in depth with the depth of 

 the furrows and pipes in the subjacent marl from 1 to 4 feet. It 

 contains many coarse flints like those of the gravel pit, but not quite 

 so large ; the greater portion quite sharp, a few however slightly 

 waterworn. 



2. A cream-coloured marl, coarsely laminated, with oblique lines of 

 stratification transverse to the direction of the valley, some alternating 

 seams of sand, and seams of chalk pebbles. On the north side of 

 the pit the cream-coloured marl alternates with dark clay, the mate- 



* Journ. Roy. Agric. Soc. vol. vii. part ii. 



